I'd love recommendations for similarly fun bands.
Not comparable in style but maybe in crazy topics are They Might Be Giants and Aquabats.
When I first heard Yoshimi I treated it like a whimsical story but then one day I heard it as an escapist fantasy of a child in distress talking about their savior and I got weepy. Is that how you're supposed to interpret the song? It doesn't matter. It hits you how it hits you.
Wayne Coyne's voice is awful. He has a terrible singing voice. And yet you don't care because it makes some devastatingly beautiful songs like Do You Realize.
I can't listen to The Flaming Lips for more than a few days at a time. Prolonged exposure makes me tired and heavy. But then, after a few months have gone by, I am drawn back to it like a moth to the light.
Quite a lot of it's in Welsh, too.
How about some Shonen Knife?
They've been around for decades and have changed multiple times to match what currently defines "pop".
Older stuff, I'd say the White Album is up that alley, if not all Beatles music. Maybe The Zombies?
Other recent stuff to throw on the pile... maybe Scissor Sisters? Might be too dark to fit the request, though.